If you look when traveling east from Charing Cross to Queen St
at the point that would be at Blythswood area there is an alcove in the
tunnel.Perhaps a proposed platform?
AS for a station entrance there are so many small coatch houses and mews in the lanes around West Regent and Bath Street, very intresting. given that the area was resedental 100 years ago and once again it is proving popular.
Last plans I heard for this area,was the grass park area in the center of the Sq was to be an underground car park 6 levals down!

According to Jim Howies excellent rail site, the 1971's Greater Glasgow
Transport Study (Clyderail Proposals) report included several proposals
that were that were not implemented:

"1. Electrification of the existing freight line from Shields Junction to High Street Junction with a new station at Trongate, on an elevated site on the London Road overbridge, and provision of a westward connecting link to join the existing Glasgow North electric line. The connection was to be made at a re-sited High Street station and this part of the scheme would link the Glasgow-Ayrshire coast electric services with those on the northern lines. Re-siting High Street Station was seen as essential because the new connecting line was to diverge from the Shields Junction-High Street Junction line at the east end of the proposed Trongate station, cross Bell Street and descend through the former College goods station yard to break through the existing retaining wall to join the present Glasgow North line on the site of the present High Street station. It would have been necessary to rebuild some 400ft of the tunnel to accommodate the new platforms.

2. On of the reasons this scheme did not go ahead in it's original format was that it was very much involved with the abortive plans for the eastern flank of the inner ring road. Had that project not been synchronised with the rail plan, it would have been necessary to build a new bridge over Bell Street on a much more elaborate scale, albeit for a temporary requirement. This proposal has since been considered on at least two other occasions albeit in modified format with High Street station remaining at it's present location.

3. A new Blythswood station midway between Queen Street and Charing Cross stations. This was a somewhat costly project for a station be located midway between Queen Street and Charing Cross on the existing Glasgow North line. Two new running tunnels would be built, one each side of the existing tunnel which would be modified to form a passenger circulating area. Although only a quarter-mile from stations on either side, the area was not thought to be conveniently accessible from either and it was felt at the time that the estimated cost of £2.5m could well be justified by the traffic potential. This opinion has not been sustained and the project has never been considered in any subsequent proposals.

4. Modification of the existing line to Bridgeton Central. The present station would be abandoned and the line projected slightly to the east to join the Central route just north of a new station, which will use the platforms of the former Bridgeton Cross station. This project was dropped and could not now be revived as the site of Bridgeton Central station has been extensively redeveloped."

Would not be that different from that of central low level and argyle street where you can look down from argyle street station and see central and vice versa. Would have been a good bit further when glasgow cross was in operation. I wonder if blythswood will ever have its station. Considering the costs it may be unlikley.